#AskEden - Bnaughty deluxe battery cover

Recently I ordered one of these vibes and the battery cover doesn't want to click shut properly. The spring on the battery contact inside the controller seems to make the batteries push on the cover and pop it off. If the cover is held on, the unit will power up and vibrate happily...until you remove your hand from holding the cover on, which kills the circuit and the batteries pop out again.

It doesn't look like anything is missing from the cover or inside the unit itself (no obvious broken tabs or anything) so it seems to be a mystery. Am I the only one with this experience on the Bnaughty deluxe or does it sound like I received a defective one?